#1) Before you use the door to go into the second big area, there's a door on the left hand side that leads down and underneath a bridge to a platform with a sluice gate. There's a switch that will drop the gate down, allowing you to cross it. Use the large tanks to get inside the building, where you'll find the Charm.
#2) This Charm is located in the Midrow Substation area. Once you have passed the Wall of Light, do not go through the door into the next area. Use the awning above the door to get onto the balcony and inside the building. You'll hear a woman screaming for help, but you don't really need to help her. Go down the stairs and all the way to the bottom, being careful of the rats. The Charm is by a corpse, right next to a book.
#3) This Charm is located in the final area. It's in a building that can be accessed from the back. Go to the alley to your right at the start, then get onto the nearby roof. From here, get onto some vents that will lead around a building. You should see two balconies here, so get on the one that's higher up and you'll find the Charm inside of that room.
